Impact of the thermomechanical load on subsurface phase transformations during cryogenic turning of metastable austenitic steels

Hendrik Hotz (), Benjamin Kirsch and Jan C. Aurich
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Hendrik Hotz: TU Kaiserslautern
Benjamin Kirsch: TU Kaiserslautern
Jan C. Aurich: TU Kaiserslautern

Journal of Intelligent Manufacturing, 2021, vol. 32, issue 3, No 15, 877-894

Abstract: Abstract When machining metastable austenitic stainless steel with cryogenic cooling, a deformation-induced phase transformation from γ-austenite to α′-martensite can be realized in the workpiece subsurface. This leads to a higher microhardness and thus improved fatigue and wear resistance. A parametric and a non-parametric model were developed in order to investigate the correlation between the thermomechanical load in the workpiece subsurface and the resulting α′-martensite content. It was demonstrated that increasing passive forces and cutting forces promoted the deformation-induced phase transformation, while increasing temperatures had an inhibiting effect. The feed force had no significant influence on the α′-martensite content. With the proposed models it is now possible to estimate the α′-martensite content during cryogenic turning by means of in-situ measurement of process forces and temperatures.

Keywords: Martensite; Cryogenic turning; Metastable austenitic steel; Deformation-induced phase transformation (search for similar items in EconPapers)
Date: 2021
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DOI: 10.1007/s10845-020-01626-6

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